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Table 3 Comparison of study populations with missing registration for BMI versus registered BMI

From: High blood pressure and overweight in children with Legg-Calvé-Perthes disease: a nationwide population-based cohort study

  Missing values Registered BMI p-value
n 67 125  
Age (mean (SD)) 5.9 (2.4) 6.1 (2.2) 0.5
Sex = Female (%) 13 (19.4) 29 (23.2) 0.7
Side = left (%) 32 (47.8) 65 (52.0) 0.7
Lateral Pillar (%)    0.6
  A 1 (1.5) 2 (1.6)  
  B 24 (35.8) 41 (32.8)  
  B/C 11 (16.4) 12 (9.6)  
  C 12 (17.9) 30 (24.0)  
  too early 19 (28.4) 40 (32.0)